<u># 内置实例</u>
<em>const bool</em> = <em>new Number( x )</em> <b>instanceof</b> <u>Number</u>
<em>const bool</em> = <em>new String( x )</em> <b>instanceof</b> <u>String</u>
<em>const bool</em> = <em>new Boolean( x )</em> <b>instanceof</b> <u>Boolean</u>
<em>const bool</em> = <em>x</em> <b>instanceof</b> <u>Array</u>
<em>const bool</em> = <em>x</em> <b>instanceof</b> <u>Event</u>
<em>const bool</em> = <em>x</em> <b>instanceof</b> <u>MouseEvent</u>
<em>const bool</em> = <em>x</em> <b>instanceof</b> <u>File</u>
<em>const bool</em> = <em>x</em> <b>instanceof</b> <u>FileList</u>
<em>const bool</em> = <em>x</em> <b>instanceof</b> <u>Date</u>
<em>const bool</em> = <em>x</em> <b>instanceof</b> <u>Node</u>
<em>const bool</em> = <em>x</em> <b>instanceof</b> <u>HTMLElement</u>
<u># 自定义实例</u>
<em>const bool</em> = <em>x</em> <b>instanceof</b> <u>MyTree</u> 		<em>// new MyTree( )</em>